/Engine/Source/Editor/EditorWidgets/Public/Filters/SAssetFilterBar.h
Add an AssetFilter to the toolbar, making it "Active" but not enabled
[TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SFilter](API\Editor\EditorWidgets\Filters\SAssetFilterBar\SFilter) > AddAssetFilterToBar ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FCustomClassFilterData](API\Editor\EditorWidgets\Filters\FCustomClassFilterData) > & CustomClassFilter )